Acceptance tests of Hamamatsu R7081 photomultiplier tubes

Abstract Photomultiplier tubes (PMTs) are traditionally an integral part of large underground experiments as they measure the light emission from particle interactions within enclosed detection media. The BUTTON experiment will utilise around 100 PMTs to response different media suitable for rare event searches. A subset low-radioactivity 10-inch Hamamatsu R7081 were tested, characterised, and compared manufacture certification. This manuscript describes laboratory tests analysis gain, peak-to-valley ratio dark rate give understanding charge response, signal-to-noise noise background acceptance test suitability these water-based detectors. Following evaluation tests, PMT performance agreed with manufacturer specifications. These results imperative modeling in detector simulations providing confidence devices once installed underground.